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September 7, 2011

DYES FOR CELLULOSE ESTER FIBERS


Acetate and triacetate fibers can  be effectively  dyed  using   disperse  dyes. The   rate   of  dyeing   is  more rapid  with   the more  hydrophobic triacetate  fibers   than  with   acetate. Under   special  conditions, azoic   and  vat dyes  may  be  used  to  dye   these  fibers. Acetate fibers  also  have   affinity for  selected   acid  and   direct   dyes.   Since  acetate   loses   its   luster  above 85°C,  dyeings   must  be  carried   out   at  or below   this  temperature. Addition of  pigments   or solventsoluble  dyes to the  acetate   or  triacetate    spinning "dope"   prior to  fiber  spinning leads   to colored   fibers   possessing   excellent colorfastness, although   the  colors  available are  limited.

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